JAR files are (in addition to being executable by a Java Virtual Machine) basically a ZIP archive containing Java classes and other items. In this case, it looks like they packaged the Linux file system for the Pre in the resource folder as another archive.

If someone can give me a reliable hint to what it is I will more than happy apply it to my phone. The sprint manager accidentally dropped my phone and I will be getting a new one as soon as they come in. Also, the proximity sensor does not work. So, I can apply anything as long as it doesn't save to my palm profile.

"The Phone Recovery Tool restores your phone's functionality and updates it to the latest versions of the operating system and other system software. After you use the tool, log in to your existing Palm profile to restore your backed-up data to your phone. "